Thanks for your reply! I'm user of VPN. The provider chooses PPTP. In Windows XP, it works and the default gateway is 192.168.115.34 how to config it in Linux? Thanks! how to add a route to the remote IP 192.168.115.1 on interface ppp0? Thanks!
In Linux I use VPN with pptp-linux below is by ifconfig -a: eth0 Link encap:Ethernet HWaddr 00:19:21:d1:80:74 inet addr:192.168.1.3 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::219:21ff:fed1:8074/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:55 errors:0 dropped:0 overruns:0 frame:0 TX packets:62 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:6258 (6.1 KiB) TX bytes:6000 (5.8 KiB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) ppp0 Link encap:Point-to-Point Protocol inet addr:192.168.115.34 P-t-P:192.168.115.1 Mask:255.255.255.255 UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1496 Metric:1 RX packets:8 errors:0 dropped:0 overruns:0 frame:0 TX packets:8 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:3 RX bytes:80 (80.0 B) TX bytes:86 (86.0 B) below is by ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN group default qlen 1000 link/ether 00:19:21:d1:80:74 brd ff:ff:ff:ff:ff:ff inet 192.168.1.3/24 brd 192.168.1.255 scope global eth0 valid_lft forever preferred_lft forever inet6 fe80::219:21ff:fed1:8074/64 scope link valid_lft forever preferred_lft forever 3: ppp0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1496 qdisc pfifo_fast state UNKNOWN group default qlen 3 link/ppp inet 192.168.115.34 peer 192.168.115.1/32 scope global ppp0 valid_lft forever preferred_lft forever